Square D ME36400LSG Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Quantity
Square D ME36400LSG - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed for heavy-duty commercial power distribution, this 400-amp molded case circuit breaker utilizes true RMS sensing for highly accurate fault detection. It connects into Square D I-Line panelboards, providing a secure and reliable mechanical fit for legacy infrastructure. The integrated Micrologic trip unit allows users to configure long-time, short-time, and ground-fault parameters to meet specific coordination requirements. This specific model crosses over to the LJA36400U44X.Specifications
| Brand | Square D |
|---|---|
| Part Number | ME36400LSG-R |
| Series | ME |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 200-400A |
|---|
| Frame Type | ME |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (3) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSG |
| Trip Function | Long-Time, Short-Time, Ground Fault |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs (Load Side) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | True RMS Sensing, 100% Rated, Extra High Interrupting Capacity |
Product FAQs
10 answersWhat type of panelboards is the ME36400LSG compatible with?
This breaker is designed exclusively for use with Square D I-Line panelboards and switchboards. It features an I-Line style plug-in connection for the line side, allowing it to mount directly to the busbar.
Can I install this ME frame breaker in a standard unit-mount enclosure?
No, the ME36400LSG features an I-Line style plug-in connection. It is specifically built for I-Line panelboards and cannot be used in standard unit-mount or lug-to-lug applications.
What does the "ME" designation indicate about the frame type?
It is built on the legacy Square D M-frame chassis. While it shares the same physical footprint as other legacy M-frame breakers, the "ME" prefix specifically indicates that it is equipped with an electronic trip unit rather than a thermal-magnetic one.
What does the "LSG" in the ME36400LSG part number indicate?
The "LSG" designates the electronic trip unit functions. It includes adjustable Long-Time, Short-Time, and Ground-Fault protection settings to allow for precise coordination in your electrical distribution system.
Can the trip unit settings on the ME36400LSG be adjusted in the field?
Yes, the electronic trip unit is fully adjustable. Electricians can fine-tune the pickup and delay settings for the long-time, short-time, and ground-fault parameters to meet specific site coordination requirements.
How does the interrupting rating (AIC) scale with voltage on the ME36400LSG?
The breaker provides a 65kAIC rating at both 240V and 480V. However, if applied on a 600V system, the maximum interrupting capacity drops to 25kAIC.
What wire sizes are accepted by the lugs on this 400A breaker?
The load side lugs accept three parallel conductors per phase, with a wire range of 3/0 AWG to 500 kcmil for either aluminum or copper wire.
Why is ground-fault protection included on this 400A breaker?
The integrated ground-fault (G) function provides equipment protection by detecting low-level leakage currents that standard overcurrent settings might miss. This is often required by the NEC for main services or feeders of this amperage.
Is the Square D ME frame still in active production?
The ME frame is a legacy molded case circuit breaker that is no longer in active production by Schneider Electric. Modern replacements typically utilize the PowerPact series.
What is the modern replacement or crossover for the ME36400LSG?
This legacy ME frame breaker crosses over to the modern Square D PowerPact LJA36400U44X. Always verify panel space and specific trip unit requirements before upgrading your infrastructure.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- BWBrian W.Verified BuyerReviewingSquare D ME36800LI - 800A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/3/26Fast delivery!
Fast Delivery and great customer service!